Questions tagged [signature]
This tag should be used for questions regarding digital signatures. A digital signature proves that the owner of a private key produced or endorsed a given message. These are used in transactions to prove that an output can be spent in a transaction.
347
questions
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24 views
blockchain scanning
Hello friends please let me know that is there any script that can scan the entire blockchain and extract the signature values and find the match of given input.
lets suppose i give the input "...
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0answers
13 views
How to create signature for the payload (data)using private key in java with bitcoinj?
I have private key as 'cUN9LNcEC54HAbWAwUs6coPSc72TcQYzxf4qSqdHJPVKSapeHzFj' and payload as 'hello', now how to create the signature for this payload using private key in java with bitcoinj library?
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2answers
36 views
How is the random number R for transaction signatures created?
I wonder about the random number used in signatures that result in R values ?
x coordinate R = G(k)
How is it created? Does it have a specific chars length?
Is there a specific random generator used, ...
2
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1answer
28 views
p2pkh vs. p2pk keeping public key private
I just got into learning Bitcoin programming through Jimmy Song's Programming Bitcoin.
Jimmy says that some of p2pkh's advantages over p2pk include:
a smaller ScriptPubKey
keeping one's public key ...
0
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1answer
21 views
Random Number In R Value , what is it actually, is it the same as Nonce in the blocks
I wonder about the random number in R value ...
if i am right , the R value is First part of the script signature which is combined of two parts (r,s)
r = Gk (elliptic curve scalar multiplication) Or ...
0
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1answer
19 views
How New Bitcoin Addresses not using Signature ? Only witness or Very Short Signature?
I have Noticed Something strange to me
Newly Used Bitcoin Addresses show repeated very short Signatures
and Multiple Witness ??
and Some not even any signature for the transaction ?
what is happening ...
0
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1answer
31 views
Can't Make Sense of Why OP_CHECKSIG Fails Here
I'm try to get to grips with verifying the signature of a P2PKH transaction.
I have an example transaction:
9ec4bc49e828d924af1d1029cacf709431abbde46d59554b62bc270e3b29c4b1
I am trying to verify the ...
0
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1answer
15 views
Distinguishing bitcoin deposits
If i had a central Bitcoin wallet, and then allowed 3 different people to deposit bitcoin into that address, would there be anyway to distinguish who they are, without knowing who's address is who, i ...
1
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1answer
39 views
Error while broadcasting the raw bitcoin testnet transaction
I am trying to create a simple P2PKH raw bitcoin testnet transaction from the scratch. Here is the information about the transaction:
hash of the UTXO consumed - ...
4
votes
1answer
206 views
Why does Bitcoin use ECDSA, instead of plain old hashing, to secure transaction outputs?
For example, let’s say I pick a random secret and hash it. Now, in the hypothetical hash-based scheme, my hash effectively replaces my public-key hash, and my random secret effectively replaces my ...
2
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2answers
61 views
Does every transaction have the same signature?
I want to know whether the bitcoin network generates the same signature for each transaction, because people have only one signature?
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1answer
38 views
signing multiple input raw transaction - algorithm and sighash types [duplicate]
I have an unsigned raw transaction:
...
0
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1answer
51 views
How can be proven that a signature is valid with it's public key
If someone wants to make a transaction, they need to sign the transaction data with their private key. For example Sign(transactionData, privateKey) creates the signature. What is exactly this Sign ...
0
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1answer
50 views
How can I sign a bitcoin address that is on a paper wallet?
I have a bitcoin address that shows I held the BTC prior to December 2019. I need to verify this but as the address refers to a paper wallet I don't seem to be able to do so. If I move the coin to ...
3
votes
1answer
60 views
What does signing a transaction mean?
What do people exactly mean when they say the person "signs" the transaction to transfer bitcoins?
Is it decrypting the previous output with your private key and encrypting it with the new ...
0
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1answer
30 views
Error: Non-canonical DER signature when attempting to broadcast signed Segwit Transactions
I'm trying to build a native Segwit transaction programmatically, however, whenever I attempt to broadcast the transaction, it returns this error:
non-mandatory-script-verify-flag (Non-canonical DER ...
3
votes
1answer
33 views
What is the “value” in a Segwit sig hash?
The BIP143 docs state that the value is: "value of the output spent by this input (8-byte little endian)"
If I have a single UTXO of value 10,000 sats and I'm using this as an input for a ...
2
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1answer
49 views
How do we know which co-signer signature is in raw hex in multisig?
I have a raw 2of3 multisig transaction. In this transaction, one co-signer already signed. The signature is for only one input.
...
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0answers
30 views
How to use Digital Signature to Sign Unsigned Transaction?
so I was trying to sign my unsigned transaction:
...
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0answers
36 views
Using a bitcoin library to create digital signatures in TypeScript/Javascript
I have been trying to sign my transactions with a digital signature for the past few days but seems that libraries in bitcoin, as far as to my knowledge do not provide a simple way to sign the ...
-1
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1answer
45 views
How to get the raw signature data of a transaction?
With the use of segwit, signature data is no longer part of transaction body and thus can’t be retrieved from block explorers. So is there a Bitcoin rpc method in order to get it directly without ...
2
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0answers
25 views
Sign transaction externally
I create a transaction with inputs from a given address / public key without signatures. Every input needs to be signed. I use a different method to generate the signatures so I can't provide a ...
0
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0answers
68 views
How to sign a transaction and also get the signature part from it using electrum console?
How do I sign a transaction with following things:
Unsigned Tx: ...
0
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0answers
21 views
How to convert High-S value to low-S value without signing the transaction again? [duplicate]
I created a bitcoin transaction but I'm getting an error when trying to broadcast it:
mandatory-script-verify-flag-failed (Non-canonical signature: S value is unnecessarily high) (code 16)
I googled ...
1
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0answers
23 views
Is there any 'Metamask-like' app for Bitcoin? [duplicate]
9 months ago someone asked this same question: Metamask-like web3 inject for bitcoin but I was wondering if there had been be any changes since then.
I'm currently looking for a Chrome extension that ...
3
votes
1answer
114 views
Any idea why Bitcoin Core signature is untrusted?
It's suppose to be a trusted signature, right?. I'm downloading Bitcoin Core from bitcoin.org
gpg --import laanwj-releases.asc
gpg: key 90C8019E36C2E964: 51 firmas no comprobadas por falta de claves
...
1
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2answers
152 views
Do you sign only the previous output of transaction?
I need to confirm that I understand how transactions work in the Bitcoin network. Ok, so:
Alice is a network node. Alice wants to send bitcoins to someone in the network. Alice is creating a ...
1
vote
1answer
85 views
How to verify if a transaction is signed correctly?
Given an arbitrary signed raw transaction, how can we easily verify if all inputs are correctly signed (assuming all inputs are existent/unspent and the fee is higher than zero)? Bitcoin core's RPC ...
0
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1answer
154 views
Signing transaction offline - manual way vs. Electrum
Being inspired by the thread (Redeeming a raw transaction step by step example required) I wanted to understand transaction signatures on the byte level.
So I created my own Linux scripts that:
...
0
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1answer
28 views
Can hashtype in BTC scriptSig contained value other than 0x01, 0x02, 0x03, 0x80, 0x81, 0x82, 0x83?
As per hashtype value in https://en.bitcoin.it/wiki/OP_CHECKSIG or https://developer.bitcoin.org/devguide/transactions.html#signature-hash-types, hashtype could either be 0x01, 0x02, 0x03, 0x80, 0x81, ...
0
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1answer
56 views
Relationship of R/S signature in between signed message and DER signature
this time is difficult for me to explain problem i was facing. i realize that R/S signature in DER signature is not match to the 1 in bitcoin signed message? Ok below is my say signed message.
-----...
1
vote
1answer
203 views
How to sign a PSBT transaction?
I have a PSBT (in Base64 format) which I need to sign using GoLang, but I can't figure out which steps I need to do that. I found this but I'm not really confident with Bitcoin and Python, so I didn't ...
1
vote
1answer
89 views
What is “signature recovery”?
Bolt #11 defines a "tagged field," n, which identifies the payee by a public key, but it isn't required. It also requires a signature which can be verified only if the public key is known. When ...
2
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0answers
27 views
signing message [duplicate]
I'm trying to sign a message with the Bitcoin Core version v0.19.0.1 wallet. But when I do I see the message "the entered address does not refer to a key." is there a way to sign a message with the ...
0
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1answer
169 views
Calculate Z from r and s
Can anyone explain me any clearly answer or code in python with examples how we can calculate Z value from r and s and inputs outputs order ?? I search in google and youtube and i not saw any ...
0
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1answer
24 views
Understanding assurance contract in bitcoin scripts
I'm having a bit of trouble understanding example 3, the bit coin assurance contract on the bitcoin wiki(https://en.bitcoin.it/wiki/Contract) where senders choose to donate money only if 1000BTC total ...
7
votes
1answer
486 views
Why is there no such thing as a redirected, forged, or fake transaction?
In the past, we had numerous questions about "fake" or "forged" transactions. Such transactions could supposedly be created even without holding any bitcoins, yet would end up in the mempool or even ...
0
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2answers
193 views
How to verify signature in java using message and public key?
I was trying different things to verify the signature but couldn't succeed.
I have got the following:
message in string or decimal array (ASCII code for each char)
public key in decimal array (which I ...
3
votes
1answer
105 views
Sign manually P2WSH native with Openssl
I'm studying the segwit part, and I want to sign P2WSH (native) manually (openssl).
I just read the BIP0143 and I see the new transaction digest.
Double SHA256 of the serialization of:
1. ...
0
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0answers
483 views
What does sigscript and witness mean?
I tried using the R scanner from the following link https://github.com/ca333/rng-scanner/blob/master/rscan.py, then I got results like this
Bitcoin Address : 3EZ5yV5FARDqEZTXzwWNt33XLVhv7hqAS2
R: ...
1
vote
1answer
45 views
difference between signing a message and signing a p2sh
can i use the sign message function to sign the serialized hex for a p2sh transaction? Are the ecdsa functions used the same or are they different? It looks like the output is in a different format ...
1
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0answers
73 views
Need help with signing transactions in Java. I am using Bouncy Castle for ECDSA
I have successfully created the raw transaction that needs to be signed. I passed the big-endian (also tried little-endian) hash256 of the raw transaction to the ECSA.sign() method (implementation ...
1
vote
1answer
99 views
How to Verify P2SH Signature
I am trying to debug an issue where i believe i might have a bad signature but i am trying to figure out how to approach it.
What is this a signature of. Private key + what (redeem script? entire raw ...
1
vote
2answers
744 views
How to find Reused R values
I use software from https://github.com/ca333/rng-scanner , I try to find r that is reused. from the software I found results
Bitcoin Address : 1GQdrgqAbkeEPUef1UpiTc4X1mUHMcyuGW
In Input NR : 141 ~ ...
1
vote
2answers
103 views
Multisignature technology in bitcoin - math and code
I am interested in the math and code behind bitcoin multisignature technology. I've been looking for actual code that creates a multisignature address/pub key, and verifies transactions/digital ...
0
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2answers
1k views
How do I to get the r, S and Z values from a raw transaction (version 2)
For example I have this raw transaction
...
2
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2answers
105 views
P2SH non-segwit and no multi-sig
I have a P2SH no segwit address (regtest) I create the redeem script with SHA256 and RIPEMD160 of my public key and prepend 0x0014
---------- Redeem Script ---------
...
0
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1answer
49 views
Where to find the amount that is being sent in a signed transaction? [closed]
I was looking at a transaction I just signed for USDT and I decoded it to compare stuff to my original address and amount. Just to be careful.
I found the address that the data is being sent to in ...
3
votes
1answer
120 views
Sign P2SH transaction with Openssl
I have an P2SH 1-3 and I want to use openssl to sign a transaction.
my redem script is
...
0
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2answers
65 views
Segwit Bitcoin Transaction Signing
As I could understand, we can recover the R and the S values from any transaction following the ScriptSig where we have DER serialization.
Segwit transactions, where the signature will be in the ...
